The effect of Mn doping on structural, magnetic and optical properties of TiO2 nanoparticles

The aim of this paper is to study the effect of Mn concentration on the structural, magneticand optical properties of TiO2 nanoparticles. TiO2 nanopowders with Mn concentration of 0%,0.2%, 1% and 5% were synthesized by the sol-gel method. The structural, surface morphologyand average crystal grain size, optical, magnetic properties and chemical compounds of thesamples are studied using XRD, FE-SEM, Uv-Vis, VSM and EDX analysis respectively. The resultsindicate that the samples are crystallized at anatase phase. Also, the average size of thenanoparticles is decreased by increasing Mn doping percent. The study of the optical propertiesshows that the absorption maximum dislocates toward higher wavelengths by adding Mnto the sample. This shift may be ascribed to the enhanced trapped electron absorption causedby the Mn-doped ions. The optical energy band gap of the doping samples shows significantreduction rather the pure state. The samples show significant paramagnetic behavior whenthe Mn concentration is 5%.